Compounds Trans Research Articles

T‐Shaped Platinum Boryl Complexes: Synthesis and Structure

A series of cationic T-shaped 14-electron boryl complexes of the type trans-[(Cy3P)2Pt(B(X)X')]+ (X=Br; X'=ortho-tolyl, tBu, NMe2, piperidyl, Br; XX'=(NMe2)2, catecholato) were synthesized by halide abstraction from trans-[(Cy3P)2Pt(Br)(B(X)X')] (Cy=cyclohexyl) with Na[BArf 4] (Arf=3,5-(CF3)2C6H3), K[B(C6F5)4], or Na[BPh4]. X-ray diffraction studies were performed on all compounds, revealing a subtle correlation between the trans-influence of the boryl moiety and the Pt-H and Pt-C separations. However, no notable agostic C-H interaction with the platinum center was detected. trans-[(Cy3P)2Pt(BCat)]+ (Cat=catecholato), the complex with the shortest Pt-H and Pt-C distances, was treated with Lewis bases (L), forming compounds of the type trans-[(Cy3P)2Pt(L)(BCat)]+, thus proving a decisive influence of the degree of trans-influence exerted by the boryl ligands on the chemical reactivity of the title complexes. Another point that was investigated and clarified is the different behavior of trans-[(Cy3P)2Pt(Br)(B(Br)Mes)] (Mes=mesityl) towards K[B(C6F5)4] with formation of the borylene species trans-[(Cy3P)2Pt(Br)(BMes)]+.

Synthesis, Structure, Spectroscopic Properties, and Antiproliferative Activity In Vitro of Novel Osmium(III) Complexes with Azole Heterocycles

Reactions of (H 2azole) 2[OsCl 6], where Hazole = pyrazole, Hpz, ( 1), indazole, Hind, ( 2), imidazole, Him, ( 3) and benzimidazole, Hbzim, ( 4) with the corresponding azole heterocycle in 1:4 molar ratio in boiling isoamyl alcohol or hexanol-1 afforded novel water-soluble osmium(III) complexes of the type trans-[OsCl 2(Hazole) 4]Cl, where Hazole = Hpz ( 5a), Hind ( 6a), Him ( 7a), and Hbzim ( 9a) in 50-70% ( 5a, 7a, 9a) and 5% ( 6a) yields. The synthesis of 7a was accompanied by a concurrent reaction which led to minor formation (<4%) of cis-[OsCl 2(Him) 4]Cl ( 8). The complexes were characterized by elemental analysis, IR spectroscopy, UV-vis spectroscopy, ESI mass spectrometry, cyclic voltammetry, and X-ray crystallography. 5a, 7a, and 9a were found to possess remarkable antiproliferative activity in vitro against A549 (non-small cell lung carcinoma), CH1 (ovarian carcinoma), and SW480 (colon carcinoma) cells, which was compared with that of related ruthenium compounds trans-[RuCl 2(Hazole) 4]Cl, where Hazole = Hpz (5b), Hind (6b), Him (7b), and Hbzim (9b).

The Essential Oil Composition of Wild Growing Sweet Marjoram (Origanum majorana L., Lamiaceae) from Cyprus—Three Chemotypes

Individual plants grown in a greenhouse from seeds of a natural population of sweet marjoram (Origanum majorana L.) from Cyprus were analyzed for their essential oil composition. Three chemotypes were detected in the population. Besides the standard ‘marjoramy’ composition (‘sabinyl chemotype’) with 74% of oil compounds belonging to the bicyclic compounds sabinene, trans- and cis-sabinene hydrate and cis-sabinene hydrate acetate (‘sabinyl compounds’), two further chemotypes were present in the population, namely a pure α—terpineol chemotype (73% α—terpineol) and a mixed sabinyl/α—terpineol chemotype (41% sabinyl compounds, 40% α—terpineol). The chemotype frequencies found in this population were 56% of the plants belonging to the sabinyl chemotype, 4% to the pure α—terpineol chemotype and 40% to the mixed sabinyl/α—terpineol chemotype.

Study by HPLC-MS of the interaction of platinum antitumor complexes with potato carboxypeptidase inhibitor (PCI)

The interaction of the well-known antitumor drug cisplatin cis-[PtCl 2(NH 3) 2] and the compound trans-[PtCl 2NH 3(4-hydroxymethylpyridine)] with the small protein potato carboxypeptidase inhibitor (PCI) and a PCI mutant in which glycine-39 was substituted by methionine has been followed by HPLC/mass spectrometry. Our results showed that both Pt drugs were able to bind PCI through Met-39 and histidines in mutated PCI, whereas only the trans complex interacted significantly with wild PCI. In the cytotoxic studies, the monofunctional adduct PCI-Met–cisplatin was neither more active nor more selective than cisplatin itself when tested against three tumor cell lines with different number of EGF receptors. Those results suggested that the poor activity of the adduct could be just due to the small fraction of cisplatin which was decoordinated from the adduct and able to penetrate the tumor cells, as well as to the changes in the structure of the platinum drug after the loss of NH 3 groups upon binding PCI-Met.

Metal Fluorides Form Strong Hydrogen Bonds and Halogen Bonds: Measuring Interaction Enthalpies and Entropies in Solution

The organometallic compound trans-(tetrafluoropyrid-2-yl)bis(triethylphosphine)-fluoronickel(II) (NiF) is shown to serve as a strong hydrogen bond and halogen bond acceptor in solution via intermolecular interactions with the fluoride ligand. The nature of the interactions has been confirmed by multinuclear NMR spectroscopy. Experimental binding constants, enthalpies, and entropies of interaction with hydrogen-bond-donor indole and halogen-bond-donor iodopentafluorobenzene have been determined by 19F NMR titration. In toluene-d8 solution indole forms a 1:1 and 2:1 complex with NiF (K1 = 57.9(3), K2 = 0.58(4)). Interaction enthalpies and entropies are -23.4(2) kJ mol-1 and -44.5(8) J mol-1 K-1, respectively, for the 1:1 complex; -14.8(8) kJ mol-1 and -53(3) J mol-1 K-1, respectively, for the 2:1 complex. In toluene-d8 solution iodopentafluorobenzene forms only a 1:1 complex (K1 = 3.41(9)) with enthalpy and entropy of interaction of -16(1) kJ mol-1 and -42(4) J mol-1 K-1, respectively. A marked solvent effect was observed for the halogen bond interaction. NMR titrations in heptane solution indicated formation of both 1:1 and 2:1 complexes of iodopentafluorobenzene with NiF (K1 = 21.8(2), K2 = 0.22(4)). Interaction enthalpies and entropies are -26(1) kJ mol-1 and -63(4) J mol-1 K-1, respectively, for the 1:1 complex; -21(1) kJ mol-1 and -83(5) J mol-1 K-1, respectively, for the 2:1 complex. There is a paucity of such experimental energetic data particularly for halogen bonds despite substantial structural data. These measurements demonstrate that halogen bonds are competitive with hydrogen bonds as intermolecular interactions and provide a suitable benchmark for theoretical calculations and quantitative input into design efforts in supramolecular chemistry and crystal engineering.

The infrared and Raman spectra of trans- and cis-tetrachloro-tetramethylbicyclopropylidene

The title compounds trans- and cis-2,2,2′,2′-tetrachloro-3,3,3′,3′-tetramethyl-bicyclopopylidene were synthesized, and their infrared and Raman spectra were recorded. Non-coincidence between the IR and Raman bands of the trans compound suggested C 2h symmetry and a planar ring system. In the cis compound most of the IR and Raman bands coincided and a C 2v symmetry seems likely. The exocyclic C C double bond gave rise to a medium/weak Raman band at 1847 cm −1 in the trans compound. In the cis derivative IR and Raman bands both at 1825 cm −1 were observed. From similarities with related molecules, the ring breathing, the antisymmetric ring stretch, the CCl 2 out-of-phase and in-phase stretch and the out-of-plane ring bending modes have been tentatively assigned for the trans and cis compounds.

Cytotoxic trans-oriented iminoether platinum complexes – Kinetics of binding to DNA oligonucleotides determined by 15N NMR spectroscopy

The kinetics of reactions between cytotoxic trans-oriented iminoether platinum complexes and DNA oligonucleotides have been studied by 1D and 2D [ 1H, 15N] HMQC NMR spectroscopy. The results for the two isomers of the mono-iminoether compound trans-[PtCl 2(NH 3){ E/ Z-HN C(OMe)Me}] ( trans- E and trans- Z) are compared with those of the bis-iminoether derivative trans-[PtCl 2{ E-HN C(OMe)Me} 2] ( trans- EE). Earlier we have shown that quite unexpectedly, trans- EE is practically inert towards a central GG residue in a 12-mer double-helical duplex. We now show that the less bulky trans- E and trans- Z compounds do bind to the interior of the duplex [5′-d(G 1G 2T 3A 4C 5C 6G 7G 8 T 9A 10C 11C 12)] 2 which contains terminal and central “hot” GG site. The platination by trans- E and trans- Z is as expected most pronounced for the solvent exposed, terminal GG-step but significantly, competitive binding is also observed for the central GG-step. The rate of platination of the terminal G-sites is almost an order of magnitude larger for the oligomer than for the monomer GMP which was studied for comparison. The role of trans-platinum carrier ligands in influencing the type and rate of formation of adducts with DNA and other relevant biomolecules is discussed.

RhCl3-Assisted C−H and C−S Bond Scissions: Isomeric Self-Association of Organorhodium(III) Thiolato Complex. Synthesis, Structure, and Electrochemistry

The ligating properties of alkyl 2-(phenylazo)phenyl thioether 1 (HL(R); R = Me, CH(2)Ph) toward Rh(III) have been examined. A novel hexacoordinated orthometalated rhodium(III) thiolato complex trans-[Rh(L)Cl(PPh3)2] 5 has been synthesized from 1 and RhCl(3).3H(2)O in the presence of excess PPh(3) via in situ C(sp(2))-H and C(sp(3))-S bond scissions, which is the first example for a coordination compound of [L](2-). We were also able to isolate the intermediate organothioether rhodium(III) compound trans-[Rh(L(R))Cl(2)(PPh(3))] 6 with 1 equiv of PPh(3) relative to both 1 and RhCl(3).3H2O in the course of the synthesis of the S-dealkylated product. PPh(3) plays a crucial role in the C(sp(3))-S cleavage process. A plausible mechanistic pathway is presented for C-S bond cleavage, and reductive cleavage by single-electron transfer mechanism is likely to be operative. The electronically and coordinatively saturated thiolato complex 5, indefinitely stable in the solid state, undergoes spontaneous self-dimerization in solution via dissociation of one coordinated PPh3 molecule to afford edge-shared bioctahedral anti-[Rh(L)Cl(PPh(3))]2 7 and syn-[Rh(L)Cl(PPh(3))]2 8 isomers. All the synthesized organosulfur rhodium(III) compounds were isolated as both air- and moisture-stable solids and spectroscopically characterized in both solution and solid states. In addition, all the representative members have been authenticated by single-crystal X-ray structure analyses. Availability of the isomeric dimers provides an opportunity to recognize the presence of noncovalent intramolecular "metallochelate-metallochelate" interaction in the sterically encumbered syn isomer. Unlike other organosulfur rhodium complexes, the monomeric thiolato complex 5 exhibits a fully reversible oxidative wave at 0.82 V vs Ag/AgCl, which is supposed to be primarily centered on the thiolato sulfur atom, and such perception is consistent with the DFT study. Formation of rhodium-bound thiyl radical cation 5(*+) by electrochemical oxidation was scrutinized by EPR spectroscopy.

Activity of Rat Cytosolic Thioredoxin Reductase Is Strongly Decreased by trans-[Bis(2-amino-5- methylthiazole)tetrachlororuthenate(III)]: First Report of Relevant Thioredoxin Reductase Inhibition for a Ruthenium Compound

A novel "Keppler type" ruthenium(III) compound trans-[bis(2-amino 5-methylthiazole)tetrachlororuthenate(III)] 1, of potential interest as an anticancer agent, was designed, synthesized, and characterized. Its interactions with various proteins were analyzed, including the selenoenzyme thioredoxin reductase, an emerging target for anticancer metallodrugs. The selective inhibition of the cytosolic form of this selenoenzyme was documented, this being the first report of significant thioredoxin reductase inhibition by a ruthenium compound.

Experimental Studies on the trans‐Influence of Boryl Ligands in Square‐Planar Platinum(II) Complexes

A series of platinum(II) boryl complexes of general formula trans-[(Cy(3)P)2Pt(Br)(BX2)], including the rare dibromoboryl species trans-[(Cy(3)P)2Pt(Br)(BBr2)], were synthesized by oxidative addition of the B-Br bond of a number of bromoboranes to [Pt(PCy3)2]. X-ray diffraction studies were performed on several such compounds. Comparison of the Pt--Br bond lengths allowed an empirical assessment of the trans-influence of different boryl ligands. A trans-influence scale was thus deduced and the results were compared with those previously computed for compounds of the type trans-[(Me(3)P)2Pt(Cl)(BX2)].

Peripheral Functionalization of Diruthenium Compounds via Heck Reactions

The coordination compounds Ru2Cl(L)3(L‘), where L is D(3,5-Cl2Ph)F and L‘ is either D(4-IPh)F or DMBA-I, underwent Heck cross-coupling reactions with terminal olefins to afford compounds 1 and 2; the organometallic compound trans-(PhC⋮C)2Ru2(L)3(DMBA-I) also underwent the Heck reaction under different conditions to yield compounds 3. Structural and voltammetric data indicated that the addition of peripheral olefins resulted in a minimal perturbation in both the coordination geometry around the Ru2 center and the electronic properties of the Ru2 species.

Platinum(II) Alkynyl Complexes Containing N‐ and S‐Propargylated Ligands: Synthesis, Structures and Formation of PtII/AgI Coordination Compounds

AbstractAlkylation of 2‐hydroxypyridine, 2‐pyridinethiol, 2‐hydroxy‐4‐methylquinoline, phthalimide and pyrazole with propargyl bromide gave a series of alkynes in high yield. These alkynes were reacted with the chloroplatinum(II) compounds trans‐[PtCl2(PPh3)2] and cis‐[PtCl2(dppe)] to afford the respective trans‐ and cis‐bis(alkynyl)platinum(II) complexes, which were characterised by spectroscopic analysis and by X‐ray diffraction. The platinum(II) complexes containing the thiopyridyl‐ and pyrazolyl‐substituted alkynes react with 1 or 2 equiv. of [Ag(NO3)(PPh3)] to give dimetallic PtII/AgI complexes.(© Wiley‐VCH Verlag GmbH &amp; Co. KGaA, 69451 Weinheim, Germany, 2007)

First Example of the Solid-State Thermal Cyclometalation of Ligated Benzophenone Imine Giving Novel Luminescent Platinum(II) Species

The (benzophenone imine)platinum(II) compounds trans-[PtCl2(Ph2C=NH)(RR'SO)] [R, R'=Me, Me (2); n-Pr, n-Pr (3); (CH2)4 (4); Me, Ph (5); Me, p-MeC6H4 (6)] were prepared by the reaction of Ph2C=NH with K[PtCl3(RR'SO)], obtained in situ from K2[PtCl4] and the corresponding sulfoxide, giving 2-6 as well as cis-[PtCl2(Ph2C=NH)2] (1) as a minor product. The complexes were characterized by 1H, 13C, and 195Pt NMR and IR spectroscopy, electrospray ionization mass spectrometry, and C, H, and N elemental analysis. The X-ray crystallography of 1 enables confirmation of the cis configuration of the complex, while in 2 and 4.1/2CHCl3, the imine and sulfoxide ligands are mutually trans. The solid-state structure of 4.1/2CHCl3 consists of two dimeric Pt moieties representing a rather weak Pt...Pt interaction. The dimeric architecture of 4.1/2CHCl3 is enhanced by the hydrogen bonding between imine H atoms and O atoms. The orthometalation of 1 and 2-6 proceeds both in the solid phase and in a toluene suspension, leading to the formation of [PtCl{Ph(C6H4)C=NH}(Ph2C=NH)] (7) and [PtCl{Ph(C6H4)C=NH}(RR'SO)] (8-12), respectively, isolated in nearly quantitative yields. Complexes 8-12 are emissive at room temperature both in solution (lambdaemmax approximately 535 nm) and in the solid state (lambdaemmax 560-610 nm), with excited-state lifetimes of ca. 300-600 ns, representing a new family of PtII-based luminescent complexes. Compounds 8 and 10 have been characterized by X-ray analysis, confirming the square-planar coordination geometry of the metal center with the almost planar platinacycles. In 8, the asymmetric unit contains two independent Pt molecules, while in 10, it includes four Pt molecules linked by the intermolecular hydrogen-bonding network between the NH group and Cl atoms.

Genotoxicity of novel trans-platinum(II) complex with diethyl (pyridin-4-ylmethyl)phosphate in human non-small cell lung cancer cells A549

The dynamic development of metal-containing anticancer drugs has started since the discovery of cis-diamminedichloroplatinum(II). For many years it was believed that trans platinum(II) compounds were non-active as antitumour agents because trans-diamminedichloroplatinum is biologically inactive although it binds to DNA and also forms monoadducts and cross-links. In the present work the ability of a novel platinum(II) compound trans-[PtCl 2(4-pmOpe) 2] to induce DNA damage in human non-small cell lung cancer cells A549 was examined using the alkaline comet assay. The obtained results revealed that the novel trans platinum(II) complex induced DNA strand breaks, which were effectively repaired during 2 h of post-incubation, and cross-links which remained unrepaired under these test conditions. Apart from that, the modified comet assay with incubation with proteinase K was used to verify the ability of trans-[PtCl 2(4-pmOpe) 2] and cis-DDP to form DNA–protein cross-links. It has been proved that only trans-[PtCl 2(4-pmOpe) 2] complex exhibits the ability to induce DNA–protein cross-links. The results suggest a different mechanism of action of this compound in comparison to cis-DDP. It seems that trans geometry and the presence of two diethyl (pyridin-4-ylmethyl)phosphates as non-leaving ligands can determine dissimilar properties of the adducts formed on DNA and the different mechanism of action of trans-[PtCl 2(4-pmOpe) 2] and in consequence the efficacy in killing cancer cells.

Cluster Core Controlled Reactions of Substitution of Terminal Bromide Ligands by Triphenylphosphine in Octahedral Rhenium Chalcobromide Complexes

Reactions of rhenium chalcobromides Cs4[{Re6(mu3-S)8}Br6].2H2O, Cs3[{Re6(mu3-Se)8}Br6].2H2O, Cs3[{Re6(mu3-Q)7(mu3-Br)}Br6].H2O (Q = S, Se), and K2[{Re6(mu3-S)6(mu3-Br)2}Br6] with molten triphenylphosphine (PPh3) have resulted in a family of novel molecular hybrid inorganic-organic cluster compounds. Six octahedral rhenium cluster complexes containing PPh3 ligands with general formula [{Re6(mu3-Q)8-n(mu3-Br)n}(PPh3)4-nBrn+2] (Q = S, n = 0, 1, 2; Q = Se, n = 0, 1) have been synthesized and characterized by X-ray single-crystal diffraction and elemental analyses, 31P{1H} NMR, luminescent measurements, and quantum-chemical calculations. It was found that the number of terminal PPh3 ligands in the complexes is controlled by the composition and consequently by the charge of the cluster core {Re6Q8-nBrn}n+2. In crystal structures of the complexes with mixed chalcogen/bromine ligands in the cluster core all positions of a cube [Q8-nBrn] are ordered and occupied exclusively by Q or Br atoms. Luminescence characteristics of the compounds trans-[{Re6Q8}(PPh3)4Br2] and fac-[{Re6Se7Br}(PPh3)3Br3] (Q = S, Se) have been investigated in CH2Cl2 solution and the broad emission spectra in the range of 600-850 nm were observed.

Promotion of DNA strand breaks, interstrand cross-links and apoptotic cell death in A2780 human ovarian cancer cells by transplatinum planar amine complexes

Cisplatin is one of the primary drugs utilized in the treatment of ovarian cancer. However, despite the initial effectiveness of chemotherapy in suppressing this disease, drug resistance almost invariably develops and cures are relatively rare. While it is generally thought that only compounds of the cis geometry express antitumor activity, a number of transplatinum derivates have shown preclinical promise. The current work investigates the influence of transplanaramine (TPA) compounds of structure trans-[Pt (O 2CR) 2 (L) (L′)], (L = NH 3, L′ = pyridine, quinoline, isoquinoline; L = L′ = pyridine; R = H, CH 3, CH 2OH, etc.) (with a focus on the contribution of the carboxylate leaving group to drug action) on growth and viability of A2780 human ovarian carcinoma cells as well as their putative mechanism(s) of cytotoxicity. The compounds, as a class, induce cell death through caspase-dependent apoptosis, with activation of both caspase 3 and caspase 9 and concomitant PARP cleavage. The trans-platinum compounds tested show induction of p53 as well as time dependent γH2AX induction, consistent with the promotion of DNA lesions. trans-[Pt(O 2CH) 2(NH 3)(4-pic)] can be shown to promote significant DNA strand breaks and DNA interstrand cross-linking. The enhanced cytotoxicity of trans-[Pt(O 2CH) 2(NH 3)(4-pic)] compared to its isostructural –O 2CCH 3 and –O 2CCH 2OH analogs may be a consequence of its accelerated cellular accumulation, increased hydrolytic activation, interstrand cross-linking and abortive efforts by the cell to repair the cross linked DNA.

Comparison of HPLC and NMR characterization of the stereogenic properties of cyclotriphosphazene derivatives containing two equivalent centres of chirality: Cis (meso) and trans (racemic) isomers

The di-spiro derivatives of the reaction of gem-disubstituted cyclotriphosphazenes, N3P3Cl4X2 (X=Ph, PhS, PhNH, PhO) with 3-amino-1-propanol are expected to exist as cis and trans geometric isomers and exist as meso and racemic, respectively. The geometric isomers were separated by column chromatography on silica gel and analyzed by elemental analysis, mass spectrometry, and 31P and 1H NMR spectroscopies. The stereogenic properties of all the compounds (trans, 2a–5a) and (cis, 2b–5b) were investigated by 31P NMR spectroscopy on the addition of a chiral solvating agent (CSA), (S)-(+)-2,2,2-trifluoro-1-(9′-anthryl)ethanol; one example of a derivative with the trans configuration (compound 5a, X=PhO) has been found where the 31P NMR/CSA method does not lead to the expected separation of the signals of enantiomers, even up to a molar ratio of CSA:compound of 50:1. On the other hand, chiral HPLC methods have been developed in order to characterize the trans (2a–5a) and cis (2b–5b) forms of the cyclotriphosphazene derivatives and give good separation of enantiomers for the trans disubstituted compounds (2a–5a). It is found that chiral HPLC is more reliable than the 31P NMR/CSA method for characterising the stereogenic properties of the cis and trans isomers of di-spiro 3-amino-1-propanoxy cyclophosphazene derivatives.

Theoretical study of 1,3-dipolar cycloaddition of nitrones to doubly activated nitriles

The mechanism of 1.3-dipolar cycloaddition of nitrones (CH2=N(CH3)O) to doubly activated nitriles RCN has been comprehensively studied by theoretical quantum-chemical methods for the model compound trans-[PtCl2(N≡CCH3)(N≡CCF3)] as an example. The reaction proceeds by a strongly asynchronous concerted mechanism through the formation of a five-membered cyclic transition state. Studying the effect of a solvent on the process shows that solvation effects inhibit cycloaddition. Double activation of RCN by introducing the electron-withdrawing substituents R = CF3 followed by coordination to a transition metal is the most promising way to enhance the reactivity of nitriles in cycloaddition reactions.

An Unexpected Possible Role of Base in Asymmetric Catalytic Hydrogenations of Ketones. Synthesis and Characterization of Several Key Catalytic Intermediates

The dihydrogen compound trans-[Ru((R)-BINAP)(H)(eta2-H2)((R,R)-dpen)]+ (2', BINAP = 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl, dpen = 1,2-diphenylethylenediamine) is a proposed intermediate in asymmetric ketone hydrogenations. It quickly reacts at -80 degrees C with 1 equiv of the base KOtBu in 2-PrOH-d8/CH2Cl2-d2 under H2 to generate trans-Ru((R)-BINAP)(H)(2-PrO)((R,R)-dpen) (4). The alkoxide 4 does not react with H2 after hours under ambient conditions. Addition of 1 equiv of KOtBu to 4 produces a hydrogen bonded species 10 that reacts readily with H2 at -80 degrees C to generate the dihydride catalytic intermediate trans-[Ru((R)-BINAP)(H)2((R,R)-dpen)] (3'). Addition of 1 equiv of ((CH3)3Si)2NK to the alkoxide 4 produces the amide catalytic intermediate 5. Compound 5 reacts reversibly with H2 to generate 3'.

STATIC AND DYNAMIC POLARIZABILITIES IN ELECTRONIC TRANSITIONS OF COMPOUNDS d and f.

The distortion electronic effects caused by the interaction of radiant energy with matter in different compound systems of transition d and f, were analyzed through static and dynamic electronic polarizabilities. This electronic property of the molecules can be obtained by absorption of lines and of its respective transition energies. Its result depends upon factors like frequency of incident radiation and strength of oscillator. In this work, absorption electronic spectra of the compounds trans-[Co(en) 2Cl2]+, cis-[Co(en)2Cl2]+, [Cu(H2O)6]2+, [Cu(en)3]2+, [Ni(H2O)6]2+ and [Ni(en)3]2+ were registred in water solution and its electronic polarizabilities were compared with compounds of the kind [M(H2O)xCl2]Cl.(n-x)H2O (M=Nd, Eu and Er, n=7 e x£7) also in water solution.